Citysaurs — A gorgeous tee that reminds you where all the fuel for your cities comes from. Technically, it's from the plants that dinosaurs ate, but you get the idea. $14.95 at Threadless.

Song of the Lonely Mountain — If you know someone who'd rather be reading the J.R.R. Tolkien book than seeing the movie this December, reward them with this bookish shirt that includes a few words in Elvish, as well as the lyrics to "Song of the Lonely Mountain." $27.20 at RedBubble

Kaiju Anatomy — For everyone who couldn't get enough of Pacific Rim, here's a Category 3 Kaiju, with anatomical labels. $22.50 at RedBubble

Burning in the Skies — A lovely design for anybody who loves a glowing, gothic landscape — with a raven at its center. $20 at Threadless

Crab Nebula — Of course you want to wear this incredible astronomical wonder on your chest. Erm, I mean, of course you want to give it to a friend for a gift. $21 at Fab

The io9 Collection — You can collect all four of io9's tees from 604 Republic, for only $18.00 each! All were created for your sartorial pleasure by Stephanie Fox. The io9 logo shirt, at the top, looks even more vivid in real life, and the "space porn" logo is in gold foil for that truly classy astro geek look.